Merge pull request #526 from AltGr/master

Fixed shell integration with some setups (.profile loaded early, zsh...)
Fix #527
Merge branch 'master' of github.com:OCamlPro/opam
Fix release target
Update CHANGES
Fix the creation of the full archive
Fix #529

'cp -a' is not standard
jenkins: add libvirt
fixes for `make with-ocamlbuild` to work
Merge pull request #530 from avsm/fix-ocamlbuild

fixes for `make with-ocamlbuild` to work
Add @avsm to the list of authors
Merge branch 'master' of github.com:OCamlPro/opam
Fix typo
Fixed config messages (typo, misleading <root>)